/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.hive.hplsql;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ColumnMap {
  private List<Column> columns = new ArrayList<>();
  private Map<String, Column> columnMap = new HashMap<>();

  public void add(Column column) {
    columns.add(column);
    columnMap.put(column.getName().toUpperCase(), column);
  }

  public Column get(String name) {
    return columnMap.get(name.toUpperCase());
  }

  public Column at(int index) {
    return columns.get(index);
  }

  public List<Column> columns() {
    return Collections.unmodifiableList(columns);
  }

  public int size() {
    return columns.size();
  }
}
